Simon peter



(N0 Model v I v s. P., GRAHAM. GOM'BINED BORING TOOL AND HOLDER. No.339,544. Patented Apr. 6, 1886.

UNITED STATES PATENT OFFICE.

'siMoN PETER GRAHAM, OF GALT, ONTARIO, CANADA.

COMBINED BORiNG-T-OOL AND HOLDER.

SPECS. EI CATION forming part of Letters Patent No. 339,544,'dated April6, 1886.

Application filed July 1-1, 18x 5. semi No. 171,618. (No model.)

To all whom it 12mg concern: &

Be it known that I, SIMo PETER GRAHAM, a citizen of the United States,and a resident of the town of Galt, in the county of Waterloo, in theProvince of Ontario, in the Dorninion of Canada, machinist, haveinvented certain new and useful Improvements in Oombined Drill and BitShanks and Holders, of

which the following is a specification.

This invention relates to improvements on shanks of drills for boringiron, or shanks of bits for boring wood, or any boring-tool where aholder is required to hold it while rotating same; and this inventionconsists of a drill or wood-bit in the shank of which two grooves areformed, to which grooves the j aws or prongs of theholder are fitted, soas to hold said drill or bit while it is being rotated The object ofthis invention is to form two grooves in a drill or wood-bit shank, andadapt the adjacent jaws or prongs of a holder to fit the same, so thatthe jaws or prongs in one holder will fit the grooves in drills ofvarious sizes, reference being bad t-othe accompanying drawings,wherein-Figure 1 is a side elevation of a holder embodying myinvention. Fig. 2is another view of same, partly in section. Fig. 3 is a perspective viewof saine,with the sleeve removed and a drillhank inserted between thejaws thereof. Fig. 4 is a perspective. view of my improved holder, Fig.5 is aperspective view of a drill, showing the grooves in the shank, towhich are fitted the jaws or prongs of the holder. Fig. dis across-sectional'view on the line as w of Fig.3. Fig. 7 represents drillsof various sizes adapted to be held by one holder, as the metal-betweenthe grooves in the small drill is the same thicknessas in the drill of alarger size, in each of which theangle of the groove is the .same,thereby enabling the holder. to firmly hold a large number of drills ofvarious sizes.

A designates a drill, in the shank B of which twogrooves,0 C, areformed, which, with the grooves in the cutting part of the drill, form agroove from end to endthroughoutthe entire length of the drill, for thepurposes hereinafter mentioned. These grooves maybe angular, circular,or any other! suitable shape;

but the' mosmsatisfactory results have been firmly held showing the jawsorprongs.-'

obtained when constructed angular, as shown in Fig. 5 of accompanyingdrawings.

1) designates a holder. formed with prongs or jaws E E, the adjacentfaces of which are fitted to correspond with the grooves G G in thedrill-shank B. beyond thejaws or prongs E E, the slitF is formed topermit it to spring or give a little when the jaws E E are being clampedto the drill-shank B by the sleeve G.

G is a sleeve, which "s screw-threaded a short distance on its innerface, at a, to correln the body of holder D,

spend with ascrew-thread, a, on the body of.

the holder 1). On the inner face of the sleeve G,

near the outer end, an inclined flange, G, is

formed, which is fitted to the beveled outer end of the, prongs or bindson thebeveled outer ends of the prongs or jaws E E, and "compresses theminto the grooves C G in the drill-shank B, to rigidly jaws E E. so thatwhen said sleeve G is screwed up this inclined flange and firinlysecurethe drill 'Ain the holderD.

In Fig. 7 of annexed drawings. the circlesi 'i represent a graduation ofdiiferent-sized drills,with the angular shape of the jaws or prongs E Eof the holder marked across them at n a, to show that a small as well asa large size of drill may be rigidly, securely, and in thesame holder.The inner edges, e, of the prongs or jaws E E areslightl y taperingtoward the body of the holder D, for the purpose of allowing for slightvariations in the forming of the v grooves in the drillor wood-bitshank.

The drill or wood-bit being grooved from endto end, as hereinbeforedescribed, it yields tothe straightener-rolls, so that the drill mayless labor to manufacture a drillor woodit;

and this invention is more economical under the rolling. process[thanunder, the process where the drills are; milled and the shanksturned, for by rolling the grooves in the drill and shank ofsamelengthwise the steel is elongated, so thata drill is constructed from amuch less qu ntit'y of material.

The drills rolledand'straightened with solid shanks cannot be accuratelysized withoutfirstsizing the solid part of theshank of the drill in aseparat'eroll, as round-bar steel variesin size in cross-section, anddoes not/yield or reduce when rolled transversely or in the direction ofits eire unlillenoem The advantage of providing this holder D withprongs or jaws 1'] E, in combination with drills A, or wood-bits inwhich grooves G G are formed, as hereinbefore described, is that atleast twice the number of differentsized llllll\ llltly be held by oneof these holders than 10 can be held by one of any other holder orSocket in present use, and this holder is of extremely small diameter,which is of great advantage to the mechanical working of the wdrill inconfined positions.

15 This holder may be attached to a drill-press or lathe by simplyturning 'the blank end of the holder to fit the spindles of saiddrill-press or lathe;

Having thus fully described my invention, I

2. A drill or wood-bit, A, in which two 25 grooves, O O, are formedthroughout its entire length, substantially as shown and described, 4

and for the purpose specified. /3 A drill or wood-bit shank, B, in whichtwo grooves, C C, are formed, the metal between the two grooves G 0being of one thick.- ness in many different sizes of drills,substantially as shown and described, and for the purpose set forth. j

4. A holder, D, formed with jaws or prongs 3 5 V

